var createError = require("http-errors");
var express = require("express");
var path = require("path");
var cookieParser = require("cookie-parser");
var logger = require("morgan");

var indexRouter = require("./routes/index.js");

var app = express();

// console.log(this)
// view engine setup
app.set("views", path.join(__dirname, "views"));
app.set("view engine", "pug");
app.engine("pug", require("pug").__express);
app.use('/static', express.static('static'));
app.use(logger("dev"));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, "public")));
//设置允许跨域访问该服务.
app.all("*", function (req, res, next) {
  
  res.header("Access-Control-Allow-Origin", "*");
  //Access-Control-Allow-Headers ,可根据浏览器的F12查看,把对应的粘贴在这里就行
  res.header("Access-Control-Allow-Headers", "Content-Type");
  res.header("Access-Control-Allow-Methods", "*");
  res.header("Content-Type", "application/json;charset=utf-8");
  next();
});

app.options((req,res) => {
  res.status(200).end();
})
// 加载路由
app.use("/api", indexRouter);
// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get("env") === "development" ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render("error");
});

module.exports = app;
